Astronomy and Geography. An angular measure of right ascension or longitude, being the 24th part of a great circle of the sphere, or 15 degrees.
| 单词 | θ1371 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical calculation > [noun] > unit (5) hour1777 Astronomy and Geography. An angular measure of right ascension or longitude, being the 24th part of a great circle of the sphere, or 15 degrees. astronomical unit1848 the mean distance between the earth and the sun (approx. 93 million miles, 150 million kilometres), used as a unit for measuring distances within the… gravitational system1888 a system of units based on a fundamental unit of weight rather than a unit of mass. au1910 astronomical unit. parsec1913 A unit of length equal to the distance at which a star would have a heliocentric parallax of one second of arc, approximately equivalent to 3·086… |
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